/**
 * Copyright 2008 Benjamin Possolo
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.javenue.util.process;

import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.javenue.util.process.PersistenceException;
import org.javenue.util.process.ProcessState;
import org.javenue.util.process.ProcessStatePersister;

/**
 * @author Benjamin Possolo
 * <p>Created on Sep 1, 2008
 */
public class HibernateProcessStatePersister implements ProcessStatePersister {

	//-----------------------------------------------------
	//Member variables
	//-----------------------------------------------------
	private SessionFactory sessionFactory;
	
	//-----------------------------------------------------
	//Public methods
	//-----------------------------------------------------
	public void setSessionFactory(SessionFactory sessionFactory) {
		this.sessionFactory = sessionFactory;
	}
	
	//-----------------------------------------------------
	//Implementation of ProcessStatePersister interface
	//-----------------------------------------------------
	public ProcessState getProcessState(Class<? extends ProcessState> processStateClass, Integer id) throws PersistenceException {
		
		try{
			return (ProcessState)sessionFactory.getCurrentSession().get(processStateClass, id);
		}
		catch(HibernateException e){
			throw new PersistenceException("error loading process state", e);
		}
	}

	public void persistChanges(ProcessState processState) throws PersistenceException {
		
		try{
			sessionFactory.getCurrentSession().flush();
		}
		catch(HibernateException e){
			throw new PersistenceException("error persisting changes to process state", e);
		}
	}

	public void saveNewInstance(ProcessState processState) throws PersistenceException {
		
		try{
			sessionFactory.getCurrentSession().save(processState);
		}
		catch(HibernateException e){
			throw new PersistenceException("error saving new process state instance", e);
		}
	}
}
